1. Telling someone that you go (went) to Harvard. Usually used in the phrase "to drop the h-bomb." It is a generally accepted principle of dropping the h-bomb that when a guy drops it, he instantly becomes more attractive, but when a girl drops it, she becomes less so. 2. Sex magazine at Harvard.

Mary was talking to a hot guy at the club the other night, but as soon as she dropped the h-bomb, he said he had to go.

Abbreviation for "Hydrogen Bomb". The hydrogen bomb is the big brother of the first nuclear bombs, Fat Man and Little Boy, which were dropped on Nagasaki and Heroshima in 1945.

The hydrogen bomb uses a hydrogen neutron, fired at high speed, into an atom of some unstable element, usually uranium. This causes the uranium particle to separate. This, in turn, releases alot of enegry. The two halfs then proceed to re-do the above steps in a Chain Reaction, which is called fission.
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EDIT: Actually it fuses together the neutrons of hydrogen in a thermonuclear reaction, not split apart the uranium.
Usually with a blast diameter of 10+ miles, as opposed to 1 mile diameter for an A bomb.

A weapon in the form of a missle warhead and, or Bomb that works on the property of fusing hydrogen together and harnessing the energy that comes from it. Some of which have sunk entire islands and can pollute the ground for at least 50 years or more.

I could turn this key, press this red button, launch this Thermonuclear weapon, and send us all to hell!